Comment #38 on issue 3006 by [email protected]: Inaccurate sin/cos values
http://code.google.com/p/v8/issues/detail?id=3006
There is a serious problem with the new sin function's behavior on very
small negative values. In Dart, we have a test that sin(x) = x for very
small numbers, since the derivative of sin at 0 is 1. The new sin function
works correctly for 0 < x < 1E-17, but for -1E17 < x < 0, sin(x) == 0
according to V8. This is wrong, and is probably happening because the
algorithm is computing sin(x + 2pi), or something.
Even if the other behavior is kept as is, I think this should be changed,
because the behavior of sin on really small numbers, represented with high
precision, should be returned with high precision. So the interpolation
table should extended below 0, or sin(x) for negative x should be defined
as -sin(-x).
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